090 infradagen mirella m_villaniiii

1 Challenge the future

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PhD candidate: Mirella Maria Villani

E-mail: [email protected]

Pavement Engineering, TUDelft

Friction in AC mixes:

Experimental and Computational Issues


• In 2012, more than 28000 people died on the roads of the European Union [EU commission, 2013]

• The vehicle accidents, where the state of the road surface plays an important role, are known to account for at least 25% of all European road fatalities [Research Framework 2007-2015, 2006]

Introduction


SKIDSAFE project

WP1 Aggregate characteristics

WP2 Mix surface characteristics

WP6 Skid Resistance

Management Tool

WP5 Hydroplaning

WP3 Tire Pavement Interaction Finite element Modelling WP4

Pavement Surface Skid Resistance


WP1 Aggregate characteristics

WP2 Mix surface characteristics

WP5 Hydroplaning

WP3 Tire Pavement Interaction Finite element Modelling WP4

Pavement Surface Skid Resistance

SKIDSAFE project

WP6 Skid Resistance

Management Tool


• Which are the most important parameters influencing friction?

• How can we improve pavement skid resistance performance

at mix design level?

• How can we monitor skid resistance and its evolution due to progressive polishing?

Research questions


6

Design, manufacture & validation of the SR-ITD

Skid Resistance Interface Testing Device


Influence of temperature, result braking test SMA p=0.3 MPa















Influence of pressure




Influence of rubber type



Influence of surfaces characteristics on friction


1


Influence of polishing on friction


1


Influence of polishing on friction


• Speed

• Temperature Rubber characteristics

• Pressure

• AC surface characteristics

Factors influencing friction


Surface properties

M3D tool for skid resistance evaluation


Microtextural

and macrotextural

characteristics, MPD, RMS,

MTD, m, ...

Surface characterization parameters

Surface characterization


Fractal approach



Fractal approach



Fractal approach



Fractal approach



2n

z

x 1

C z x z x




H, ,




Surface characterization: different AC mixes

1



Surface characterization: different polishing levels



+ rubber

characteristics

m


H, ,



V T

3

diss

0 0

E d x dt

Internal dissipated energy

M2D tool for friction evaluation

𝜀

𝜎



F

d

V T

3

diss

0 0

E d x dt




F

d

V T

3

diss

0 0

E d x dt max

min

-2H-1ω 2

HH 2

N 0 s minω

F Hξ1 ωμ = = ω ''(ω) dω

F 2(2π) σ v 2πvξ ω

E















• Particular attention should be placed to the influence of

temperature on friction.

• Tools like the M3D can provide a more objective way of evaluating frictional characteristics of AC mixes.

Research answers


• Use of profiles obtained from profilometers for in-time friction evaluation for road monitoring

• Including rolling resistance and noise emission in the M3D tool

• Combine CAPA-3D and M3D tool

Work in progress


Sponsors

http://www.skidsafe.org/index1.html


Sponsors



Sponsors

E-mail: [email protected]
